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An L-Shaped Slot Circularly Polarized Patch Antenna for Wireless Communication


Corresponding Author:



Department of Electronics and Communication Engineering, Hindustan Institute of Technology and Science, Chennai, Tamilnadu, and India
*Corresponding Author: M. Saravanan, Email: [email protected]


A circular-polarized patch antenna with compact size operating at 2.3 GHz band is presented. The antenna utilizes L shaped slot in the radiator in order to achieve circularly polarized radiation pattern. The prototype of the antenna is fabricated and is fed by a 50Ω strip line. The antenna achieves a symmetrical radiation pattern around zenith.  The measured impedance bandwidth of |S11| less than -10dB is from 2.3GHz to 2.35GHz and is in good agreement with simulation results. The antenna achieves better cross-polarization isolation of -19 dB and wider 3dB axial ratio beamwidth (ARBW) of -50o≤ARBW≤45o at its resonating frequency. The antenna finds application in modern wireless communication system.


Antenna feeds; Antenna radiation patterns; Circular polarization; Microstrip antennas; Slot antennas

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Cite This Paper:

M.Saravanan (2020). An L-Shaped Slot Circularly Polarized Patch Antenna for Wireless Communication. Journal of the Institute of Electronics and Computer, 2, 1-11.


[1] Chen, Z.N., Liu, D., Nakano, H., Qing, X. and Zwick, Th. (2016) Handbook of Antenna Technologies. 1st ed. Springer.
[2] Bo Yuan, Xiao Hong Zhang, Zhi Fang Hu and Guo Qing Luo (2016) An Axial-Ratio Beamwidth enhancement of patch antenna with diagonal slot and square ring. Microwave Opt Technol Lett, 58,672-675.
[3] Shaalan, A.A. (2009) A Compact Broadband H-Slot and Horizontal H-Slot Patch Antenna for Circular Polarization. J Infrared Milli Terahz Waves, 30, 657–669.
[4] Lam, K.Y., Luk, K.M., Lee, K.F., Wong, H. and Ng, K.B. (2011) Small Circularly Polarized U-Slot Wideband Patch Antenna. IEEE Antennas Wireless Propag, 10, 87-90.
[5] Xiulong. L. and Ammann, M.J. (2014) A Cavity-Backed Spiral Slot Antenna with Wide Axial Ratio Beamwidth for GPS System. Microwave Opt Technol Lett, 56, 1050-1054.
[6] You, M., Lu, W.J., Xue, B., Zhu, L. and Zhu, H.B. (2016) A Novel Planar Endfire Circularly Polarized Antenna with Wide Axial-Ratio Beamwidth and Wide Impedance Bandwidth. IEEE Trans Antennas Propag, 64(10), 4554-4559.
[7] Luo, G.Q., Hu, Z.F., Liang, Y., Yu, L.Y. and Sun, L.L. (2009) Development of low profile cavity backed crossed slot antennas for planar integration.  IEEE Trans Antennas Propag, 57(10), 2972 -2979.
[8] Luo, Y., Chu, Q.X. and Zhu, L. (2015) A Low-Profile Wide-Beamwidth Circularly-Polarized Antenna via Two Pairs of Parallel Dipoles in a Square Contour. IEEE Trans Antennas Propag, 63(3), 931-936.
[9] Ding, K., Wang, Y. and Xiong, X. (2012) A Novel Wide-Beam Circularly Polarized Antenna for SDARS Applications. IEEE Antennas Wireless Propag Lett, 11, 811-813.
[10] Liu, W., Zhu, L. and Choi, W.W. (2016) Low-profile wide-beamwidth circularly-polarised patch antenna on a suspended substrate.  IET Microwaves, Antennas & Propagation, 10(8), 885-890.
[11] Luo, Y., Chu, Q.X. and Zhu, L. (2015) A Miniaturized Wide-Beamwidth Circularly Polarized Planar Antenna via Two Pairs of Folded Dipoles in a Square Contour. IEEE Trans Antennas Propag, 63(8), 3753-3759.
[12] Bao, X.L. and Ammann, M.J. (2008) Dual-frequency dual circularly-polarised patch antenna with wide beamwidth. Electron Lett, 44(21), 1233–1234.
[13] Ka Ming Mak and Kwai Man Luk (2009) A Circularly Polarized Antenna with Wide Axial Ratio Beamwidth, IEEE Trans. Antennas Propag, 57(10), 3309-3312.
[14] Rajanna, P. K. T.,  Rudramuni, K. and Kandasamy, K. (2019) A High-Gain Circularly Polarized Antenna Using Zero-Index Metamaterial, IEEE Antennas and Wireless Propagation Letters, 18(6),1129-1133. doi: 10.1109/LAWP.2019.2910805
[15] Majumder, B., Kandasamy, K. and Ray, K. P.  (2018) A zero index based meta-lens loaded wideband directive antenna combined with reactive impedance surface, IEEE Access, 6, 28746-28754.
[16] Gabriel Massie, et al., (2010) A New Wideband Circularly Polarized Hybrid Dielectric Resonator Antenna, IEEE Antennas Wireless Propag. Lett, 99, 347-350.
[17] Yang, Y.-H., Sun, B. and Guo, J. (2019) A Low Cost, Single-Layer, Dual Circularly Polarized Antenna for Millimeter-Wave Applications, IEEE Antennas and Wireless Propagation Letters, 18(4), 651-655.
[18] Zhou, S.-G., Huang, G.-L. and Chio, T.-H. (2018) A lightweight wideband dual-circular-polarized waveguide cavity array designed with direct metal laser sintering considerations, IEEE Trans. Antennas Propag., 66(2), 675-682.
[19] Cheng, Y. J., Wang, J. and Liu, X. L. (2017) 94 GHz substrate integrated waveguide dual-circular-polarization shared-aperture parallel-plate long-slot array antenna with low sidelobe level, IEEE Trans. Antennas Propag., 65(11), 5855-5861.
[20] Zhao, Y. and Luk, K.-M. (2018) Dual circular-polarized SIW-fed high-gain scalable antenna array for 60 GHz applications, IEEE Trans. Antennas Propag., 66(3), 1288-1298.
[21] Park, S.-J. and Park, S.-O. (2017) LHCP and RHCP substrate integrated waveguide antenna arrays for millimeter-wave applications, IEEE Antennas Wireless Propag. Lett., 16, 601-604.